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Pension Plans (Summary of Target Allocations and Invested Asset Allocations) (Details)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
U.S. Qualified Defined Benefit Plans [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Total Fixed Income and Equity Securities, TARGET LEVELS 100.00%  
Total Fixed Income and Equity Securities 100.00% 100.00%
U.S. Qualified Defined Benefit Plans [Member] | Fixed Maturities    
Defined Benefit Plan Disclosure [Line Items]    
Total Fixed Income and Equity Securities, TARGET LEVELS 83.00%  
Total Fixed Income and Equity Securities 84.00% 84.00%
U.S. Qualified Defined Benefit Plans [Member] | Money Market Funds    
Defined Benefit Plan Disclosure [Line Items]    
Total Fixed Income and Equity Securities, TARGET LEVELS 2.00%  
Total Fixed Income and Equity Securities 1.00% 1.00%
U.S. Qualified Defined Benefit Plans [Member] | Fixed Income Securities    
Defined Benefit Plan Disclosure [Line Items]    
Total Fixed Income and Equity Securities, TARGET LEVELS 85.00%  
Total Fixed Income and Equity Securities 85.00% 85.00%
U.S. Qualified Defined Benefit Plans [Member] | Domestic    
Defined Benefit Plan Disclosure [Line Items]    
Total Fixed Income and Equity Securities, TARGET LEVELS 12.00%  
Total Fixed Income and Equity Securities 12.00% 12.00%
U.S. Qualified Defined Benefit Plans [Member] | International    
Defined Benefit Plan Disclosure [Line Items]    
Total Fixed Income and Equity Securities, TARGET LEVELS 3.00%  
Total Fixed Income and Equity Securities 3.00% 3.00%
U.S. Qualified Defined Benefit Plans [Member] | Equity Securities    
Defined Benefit Plan Disclosure [Line Items]    
Total Fixed Income and Equity Securities, TARGET LEVELS 15.00%  
Total Fixed Income and Equity Securities 15.00% 15.00%
Chaucer Pension Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Total Fixed Income and Equity Securities, TARGET LEVELS 100.00%  
Total Fixed Income and Equity Securities 100.00% 100.00%
Chaucer Pension Plan [Member] | Fixed Maturities    
Defined Benefit Plan Disclosure [Line Items]    
Total Fixed Income and Equity Securities, TARGET LEVELS 30.00%  
Total Fixed Income and Equity Securities 32.00% 32.00%
Chaucer Pension Plan [Member] | Domestic    
Defined Benefit Plan Disclosure [Line Items]    
Total Fixed Income and Equity Securities, TARGET LEVELS 15.00%  
Total Fixed Income and Equity Securities 14.00% 14.00%
Chaucer Pension Plan [Member] | International    
Defined Benefit Plan Disclosure [Line Items]    
Total Fixed Income and Equity Securities, TARGET LEVELS 45.00%  
Total Fixed Income and Equity Securities 42.00% 43.00%
Chaucer Pension Plan [Member] | Equity Securities    
Defined Benefit Plan Disclosure [Line Items]    
Total Fixed Income and Equity Securities, TARGET LEVELS 60.00%  
Total Fixed Income and Equity Securities 56.00% 57.00%
Chaucer Pension Plan [Member] | Real Estate Funds    
Defined Benefit Plan Disclosure [Line Items]    
Total Fixed Income and Equity Securities, TARGET LEVELS 10.00%  
Total Fixed Income and Equity Securities 12.00% 11.00%